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ANSWER
EXPLANATION
Since the altitude, |GJ| bisects the base of the triangle, it follows that, the triangle is an isosceles triangle.
This implies that,.
In terms of x, we have the equation.
We now group like terms to obtain,
This implies that,
Let us divide through by 2 to get,
We can see from the diagram that,
We substitute x=5 to get,
This simplifies to,
EXPLANATION
Since the altitude, |GJ| bisects the base of the triangle, it follows that, the triangle is an isosceles triangle.
This implies that,.
In terms of x, we have the equation.
We now group like terms to obtain,
This implies that,
Let us divide through by 2 to get,
We can see from the diagram that,
We substitute x=5 to get,
This simplifies to,
The highlighted sector is exactly 3/4 of the circle area, because is 3/4 of
which is a complete rotation.
Since you are given the radius, you can compute the area as
So, 3/4 of this area would be squared cm.
The remaining sector, of course, is squared cm.
